I'm not sure about it keeping boxsprings or mattresses together, but when using it to keep sheets from pulling up and off the corners of the mattress (instead of those suspende...
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Bed Bridge Mattress Belt Strap Joiner - 33ft Mattress Belt Converter Kit to Convert Twin Beds into King, Twin XL to King - Strong, Lightweight, Easy to use Bed Doubling System & Bed Gap Filler
Price: $11.99
Description
The BELVOIR mattress strap allows you to connect any two smaller beds to form a larger bed in minutes\r\n\r\n ✔️ Easily configure your beds or daybeds for guestrooms, B&Bs, guesthouses, vacation rentals\r\n ✔️ Holds the mattresses securely in place so they do not slide or move when sleeping\r\n ✔️ Fully adjustable\r\n\r\n\r\n\r\nJoins these combinations of mattresses:\r\n Twin x 2\r\n Twin + Twin XL\r\n Twin + Full / Full XL\r\n Twin + Queen\r\n Twin + Olympic Queen\r\n Twin + King\r\n Twin + Cal King\r\n Twin XL x 2\r\n Twin XL + Full / Full XL\r\n Twin XL + Queen\r\n Twin XL + Olympic Queen\r\n Twin XL + King\r\n Twin XL + Cal King\r\n Full XL x 2\r\n Full XL + Queen\r\n Full XL + Olympic Queen\r\n Queen x 2\r\n\r\n\r\nCombinations that require 2 belts joined together:\r\n Full XL + King\r\n Full XL + Cal King\r\n Queen + Olympic Queen\r\n Queen + King\r\n Queen + Cal King\r\n Olympic Queen x 2\r\n Olympic Queen + King\r\n Olympic Queen + Cal King\r\n King x 2\r\n King + Cal King\r\n Cal King + Cal King
